Koss sb45 communication headsets deliver a full range of sound that enables you to not only hear clearly but also speak clearly featuring kossrsquo clear voice technology cvt the sb45 noise cancelling microphone eliminates excessive background noise this enables pc voice applications such as speech recognition much easier to use the comfortable design of the koss sb45 will allow you to comfortably wear these headsets over an extended period the large closed soft leatherette ear cup max